Add dependency scanner for Qt Resource Files (.qrc).

[SVN r41908]

src/tools/qt4.jam

@@ -117,6 +117,9 @@ rule init ( prefix )
         # Generates .cpp file from qrc file
         generators.register-standard qt4.rcc : QRC : CPP(qrc_%) ;
         
+        # dependency scanner for wrapped files
+        type.set-scanner QRC : qrc-scanner ;
+
         # Test for a buildable Qt.
         if [ glob $(.prefix)/Jamroot ]
         {
@@ -605,3 +608,19 @@ actions uic-h
 {
     $(.binprefix)/uic $(>) -o $(<)
 }
+
+# Scanner for .qrc files.
+# Look for the CDATA section of the <file> tag.
+# Ignore the "alias" attribute.
+# See http://doc.trolltech.com/qt/resources.html
+# for detailed documentation of the Qt Resource System.
+class qrc-scanner : common-scanner 
+{
+    rule pattern ( )
+    {
+        return "<file.*>(.*)</file>" ;
+    }
+}
+
+# Wrapped files are "included".
+scanner.register qrc-scanner : include ;